-50.69% is the change from 870 to 429
Calculation steps:
[( 429 - 870 ) ÷ 870] x 100 = -50.69%
Formula
Percentage change = [(429 - 870) / 870] x 100
Subtract the new number by the original number
429 - 870 = -441
-441 ÷ 870 = -0.506896551724138
-0.506896551724138 x 100 = -50.69%